Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::support_v2::CaseAttachmentServiceClient(
google::cloud::support_v2::MakeCaseAttachmentServiceConnection(
options));
}
Follow these links to find examples for other *Client classes:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-21 UTC."],[[["This page details how to override default authentication credentials when using Google Cloud client libraries, which typically rely on Application Default Credentials."],["The `UnifiedCredentialsOption` allows you to specify authentication details, such as loading credentials from a service account key file, as demonstrated in the provided code example."],["The content lists various available versions, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc, with version 2.33.0 being the version primarily referenced."],["Examples of how to use this override mechanism are provided for `CaseAttachmentServiceClient`, `CaseServiceClient`, and `CommentServiceClient`."],["For more information on creating `Credentials` objects and managing service account keys, refer to the linked \"Authentication Components\" and \"Best practices for managing service account keys\" guides."]]],[]]
